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Hello, I'm new to WordPress and I need some help. I made a sites everything working perfectly, pictures etc. but now I want to add some "custom" code think of it as a function (it uses html, css and js). I want to somehow add this code and be able to call it in certain parts of the site, for example after the product photos.

I guess I can help
Ask chatgtp and you will get very close to what every you want to achieve
Try https://wordpress.org/plugins/code-snippets/
I can help you with that.
look for functions.php and put your custom code there. Call it using shortcode or direct echo